Editing Scalable Coherent Interface (section)

==Legacy==
SCI is a standard for connecting the different resources within a multiprocessor computer system, and it is not as widely known to the public as for example the [[Ethernet]] family for connecting different systems. Different system vendors implemented different variants of SCI for their internal system infrastructure. These different implementations interface to very intricate mechanisms in processors and memory systems and each vendor has to preserve some degrees of compatibility for both hardware and software.

Gustavson led a group called the Scalable Coherent Interface and Serial Express Users, Developers, and Manufacturers Association and maintained a web site for the technology starting in 1996.<ref name="site" /> A series of workshops were held through 1999.
After the first 1992 edition,<ref name="std92" /> follow-on projects defined shared data formats in 1993,<ref>{{Cite book |title= IEEE Standard for Shared-Data Formats Optimized for Scalable Coherent Interface (SCI) Processors |publisher= IEEE Standards Board |date= April 25, 1994 |isbn= 9780738112091 |url= http://www.techstreet.com/products/27035 }}</ref> a version using [[low-voltage differential signaling]] in 1996,<ref>{{Cite book |title= IEEE Standard for Low-Voltage Differential Signals (LVDS) for Scalable Coherent Interface (SCI) |publisher= IEEE Standards Board |date= July 31, 1996 |isbn= 9780738131368 |url= http://www.techstreet.com/products/27033 }}</ref> and a memory interface known as Ramlink later in 1996.<ref>{{Cite book |title= EEE Standard for High-Bandwidth Memory Interface Based on Scalable Coherent Interface (SCI) Signaling Technology (RamLink) |publisher= IEEE Standards Board |date= September 16, 1996 |isbn= 9780738131375 |url= http://www.techstreet.com/products/27034 }}</ref>
In January 1998, the [[SLDRAM#Synchronous-Link DRAM (SLDRAM)|SLDRAM]] corporation was formed to hold patents on an attempt to define a new memory interface that was related to another working group called SerialExpress or Local Area Memory Port.<ref>{{Cite web |title= Organizing for Alternatives |author= David B. Gustavson |url= http://www.scizzl.com/Future/OrganizeToWin/tsld001.htm |date= February 10, 1999 }}</ref><ref>{{Cite journal |title= SerialExpress-a high performance workstation interconnect |date= May–Jun 1998 |journal= IEEE Micro |publisher= IEEE |author=  David V. James |author2=  David B. Gustavson |author3=  B. Fleischer |volume= 18 |issue= 3 |doi= 10.1109/40.683105 |pages= 54–65 }}</ref>
However, by early 1999 the new memory standard was abandoned.<ref>{{Cite news |title= ISSCC: SLDRAM group morphs to DDR II |work= EE Times |date= February 19, 1999 |url= http://www.eetimes.com/document.asp?doc_id=1138593 |author= David Lammers }}</ref>

In 1999 a series of papers was published as a book on SCI.<ref>{{Cite book |title=SCI: Scalable Coherent Interface: Architecture and Software for High-Performance Compute Clusters |series= Lecture Notes in Computer Science |publisher= Springer |editor= Hermann Hellwagner |editor2= Alexander Reinefeld |year= 1999 |isbn= 978-3540666967  }}</ref>
An updated specification was published in July 2000 by the [[International Electrotechnical Commission]] (IEC) of the [[International Organization for Standardization]] (ISO) as ISO/IEC 13961.<ref>{{Cite book |title= Scalable Coherent Interface (SCI) |publisher= International Standard ISO/IEC 13961 IEEE Std 1596 |date= July 10, 2000 |url= http://webstore.iec.ch/preview/info_isoiec13961%7Bed1.0%7Den.pdf }}</ref>